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    Variability in the Internal Wave Field Induced by the Atlantic Deep Western Boundary Current at 16°N

    Source: Journal of Physical Oceanography:;2013:;Volume( 044 ):;issue: 002::page 492
    Author:
    Köhler, Janna
    ,
    Mertens, Christian
    ,
    Walter, Maren
    ,
    Stöber, Uwe
    ,
    Rhein, Monika
    ,
    Kanzow, Torsten
    DOI: 10.1175/JPO-D-13-010.1
    Publisher: American Meteorological Society
    Abstract: ive years of continuous mooring data combined with conductivity?temperature?depth (CTD)/lowered acoustic Doppler current profiler (LADCP) measurements from five cruises are used to investigate the influence of the deep western boundary current (DWBC) on the internal wave field and associated vertical mixing at the continental slope at 16°N in the western Atlantic. The mooring data include 2-hourly rotor current-meter measurements and temperature/conductivity time series with a high temporal resolution of 5?20 min. Thus, the data resolve time scales ranging from the low-frequency variability of the large-scale DWBC that generates internal waves due to interactions with the topography to frequencies greater than that of internal waves that are associated with vertical mixing. Estimates of the vertical mixing induced by the breaking of the observed internal waves show elevated diapycnal diffusivities of up to 10?3 ± 0.4 ? 10?3 m2 s?1 in the bottommost 1500 m during times of a strong DWBC (maximum velocities at the mooring site up to 50 cm s?1) whereas vertical mixing rates are about an order of magnitude lower (1.6 ? 10?4 ± 0.6 ? 10?4 m2 s?1) during weak flow. During periods of a strong DWBC, spectra of horizontal velocity and internal wave available potential energy change substantially at depths below 1200 m and show a strong increase in variance particularly in the near-inertial frequency band. Low-frequency, near-inertial waves generated by topography/DWBC interaction on the slope to the west of the moorings can potentially cause this observed wave intensification; ray paths estimated for these waves agree well with the observed spectral changes at different depths. Variability in the high-frequency range, considered as a proxy for turbulent mixing, is significantly correlated with the DWBC strength above the continental slope.
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      Variability in the Internal Wave Field Induced by the Atlantic Deep Western Boundary Current at 16°N

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226553
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    contributor authorKöhler, Janna
    contributor authorMertens, Christian
    contributor authorWalter, Maren
    contributor authorStöber, Uwe
    contributor authorRhein, Monika
    contributor authorKanzow, Torsten
    date accessioned2017-06-09T17:19:58Z
    date available2017-06-09T17:19:58Z
    date copyright2014/02/01
    date issued2013
    identifier issn0022-3670
    identifier otherams-83339.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226553
    description abstractive years of continuous mooring data combined with conductivity?temperature?depth (CTD)/lowered acoustic Doppler current profiler (LADCP) measurements from five cruises are used to investigate the influence of the deep western boundary current (DWBC) on the internal wave field and associated vertical mixing at the continental slope at 16°N in the western Atlantic. The mooring data include 2-hourly rotor current-meter measurements and temperature/conductivity time series with a high temporal resolution of 5?20 min. Thus, the data resolve time scales ranging from the low-frequency variability of the large-scale DWBC that generates internal waves due to interactions with the topography to frequencies greater than that of internal waves that are associated with vertical mixing. Estimates of the vertical mixing induced by the breaking of the observed internal waves show elevated diapycnal diffusivities of up to 10?3 ± 0.4 ? 10?3 m2 s?1 in the bottommost 1500 m during times of a strong DWBC (maximum velocities at the mooring site up to 50 cm s?1) whereas vertical mixing rates are about an order of magnitude lower (1.6 ? 10?4 ± 0.6 ? 10?4 m2 s?1) during weak flow. During periods of a strong DWBC, spectra of horizontal velocity and internal wave available potential energy change substantially at depths below 1200 m and show a strong increase in variance particularly in the near-inertial frequency band. Low-frequency, near-inertial waves generated by topography/DWBC interaction on the slope to the west of the moorings can potentially cause this observed wave intensification; ray paths estimated for these waves agree well with the observed spectral changes at different depths. Variability in the high-frequency range, considered as a proxy for turbulent mixing, is significantly correlated with the DWBC strength above the continental slope.
    publisherAmerican Meteorological Society
    titleVariability in the Internal Wave Field Induced by the Atlantic Deep Western Boundary Current at 16°N
    typeJournal Paper
    journal volume44
    journal issue2
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-010.1
    journal fristpage492
    journal lastpage516
    treeJournal of Physical Oceanography:;2013:;Volume( 044 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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